Table 1

Characteristics of the VPT/ELBW and control groups

VPT/ELBWFull-term controls
Live births283199
Survival up to age 8 years, % (n) live births71.0 (201)100 (199)
Assessed at age 2 years, % (n) survivors99.0 (199)94.5 (188)
Assessed at age 8 years, % (n) survivors94.0 (189)86.9 (173)
Gestational age, completed weeks (seen at 8 years of age), mean (SD)26.5 (2.0)39.3 (1.1)
Birth weight (g; seen at 8 years of age), mean (SD)832 (164)3,507 (453)
Male, % (n) seen at 8 years of age52.9 (100)53.2 (92)
Mother's private health insurance status, % (n) seen at 829.6 (56)32.9 (57)
Mother born in English-speaking country, % (n) seen at 881.5 (154)83.2 (144)